Hyalosynedra lanceolata Belando, Jiménez & Aboal

Joh, Gyeongje, 2021, Distribution and frequent occurrence of diatom taxa (Bacillariophyta) inhabiting warmer oceans in Seogwipo coast of Jeju Island, southernmost Korea, Phytotaxa 517 (1), pp. 1-67 : 21-24

29. Hyalosynedra lanceolata Belando, Jiménez & Aboal ( Figs 69–72 , 187 , 198, 199 )

Type locality: Mar Menor Lagoon, El Ciervo Island , SE Spain .

Reference: Belando et al. 2018, p. 3, figs 1–25.

Morphometrics: Valves 65–217 (21–266) μm long, and 3–5 (1–4) μm wide, transapical striae unresolved in LM, 52 (47–52) n 10 μm in SEM.

Remarks: Hyalosynedra lanceolata is closely similar in valve morphology to Hyalosynedra laevigata (Grunow) Williams , but differs from in two features above all others, biseriate striae, and narrow valve width (2.8–4.5 vs 5–7 μm). Sabir et al. (2018) noted that the striae of H. laevigata are biseriate, but it is assumed that the striae appear to be paired due to closing bars across the areolae or missing of closing layer on the areolae. This taxon was reported from type locality, Mar Menor Lagoon in the Mediterranean, yet not in the other places. It is so morphologically close to H. laevigata that their habitats or distribution are expected to be same each other, in the Mediterranean and some warmer oceans such as Florida and the Caribbean Sea, like H. laevigata . It is probably distributed from tropical to subtropical coasts. This taxon is encountered frequently as an epiphyte in the lagoon and pseudo-lagoons along the Seogwipo coast, representing a new record to South Korea.

Figures

FIGURES 69–77. Diatom taxa of Seogwipo coast in Jeju Island (8). Figs 69–72. Hyalosynedra lanceolata. Figs 73, 74. Cocconeis heteroidea. Figs 75–77. Achnanthes trachyderma. Scale bars = 10 μm.

FIGURES 185–192. Diatom taxa of Seogwipo coast in Jeju Island (19). Figs 185, 186. Leudugeria janischii: the internal valve and septa at apex (Fig. 185) and external valve (Fig. 186). Fig. 187. Hyalosynedra lanceolata. Figs. 188–192. Licmophora pfannkucheae: head of external valves showing two spines and rimpoportuae in the sternum (Figs 188, 189), internal view of rimpoportulae (Fig. 190), and tail apex of internal and external valves (Figs 191, 192) Figs 185–192: SEM. Scale bars = 20 μm (Figs 185, 186), 5 μm (Fig. 187), 2 μm (Figs 188, 190–192), 1 μm (Fig. 189).

FIGURES 193–202. Diatom taxa of Seogwipo coast in Jeju Island (20). Figs. 193, 194. Cocconeis convexa: sternum valve (Fig. 180) and raphe valve (Fig. 181) of external view. Figs. 195–197, 200, 201. Navicula zostereti: characteristic lineate striation and cental raphe endings in external valves. Figs 198, 199. Hydrosynedra lanceolata: external valves. Fig. 202. Amphipentas pentacrinus: internal valve. Figs 193–202: SEM. Scale bars = 20 μm (Fig. 201), 10 μm (Figs 196, 202), 5 μm (Figs 193, 194, 197), 2 μm (Figs 195, 200), 1 μm (Figs 198, 199).